INTERIM FINANCIAL REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total revenues	$ 10,852	$ 9,833	$ 21,041	$ 18,958
Change	$ 1,019		$ 2,083
Percent of change	10.00%		11.00%
Product sales
Total revenues	$ 7,327	6,943	$ 14,831	14,396
Change	$ 384		$ 435
Percent of change	6.00%		3.00%
Product sales | Soundwall sales
Total revenues	$ 1,939	2,525	$ 4,053	5,005
Change	$ (586)		$ (952)
Percent of change	(23.00%)		(19.00%)
Product sales | Architectural panel sales
Total revenues	$ 424	245	$ 424	457
Change	$ 179		$ (33)
Percent of change	73.00%		(7.00%)
Product sales | SlenderWall sales
Total revenues	$ 772	1,422	$ 2,735	2,565
Change	$ (650)		$ 170
Percent of change	(46.00%)		7.00%
Product sales | Miscellaneous wall sales
Total revenues	$ 406	267	$ 769	759
Change	$ 139		$ 10
Percent of change	52.00%		1.00%
Product sales | Barrier sales
Total revenues	$ 1,817	1,590	$ 3,408	3,875
Change	$ 227		$ (467)
Percent of change	14.00%		(12.00%)
Product sales | Easi-Set and Easi-Span building sales
Total revenues	$ 1,335	560	$ 2,369	1,062
Change	$ 775		$ 1,307
Percent of change	138.00%		123.00%
Product sales | Utility and farm product sales
Total revenues	$ 449	246	$ 757	460
Change	$ 203		$ 297
Percent of change	83.00%		65.00%
Product sales | Miscellaneous sales
Total revenues	$ 185	88	$ 316	213
Change	$ 97		$ 103
Percent of change	110.00%		47.00%
Service revenue
Total revenues	$ 3,525	2,890	$ 6,210	4,562
Change	$ 635		$ 1,648
Percent of change	22.00%		36.00%
Service revenue | Barrier rentals
Total revenues	$ 582	340	$ 1,163	649
Change	$ 242		$ 514
Percent of change	71.00%		79.00%
Service revenue | Royalty income
Total revenues	$ 429	506	$ 735	727
Change	$ (77)		$ 8
Percent of change	(15.00%)		1.00%
Service revenue | Shipping and installation revenue
Total revenues	$ 2,514	$ 2,044	$ 4,312	$ 3,186
Change	$ 470		$ 1,126
Percent of change	23.00%		35.00%